// exam_10_5: stock10.cpp
// --Stock class with constructors, destructor added
#include <iostream>
#include "stock10.h"

Stock::Stock()
{
	std::cout << "Default constructor called\n";
	company = "no name";
	shares = 0;
	share_val = 0.0;
	total_val = 0.0;
}

Stock::Stock(const std::string &co, long n, double pr)
{
	std::cout << "Constructor using " << co << " called\n";
	company = co;
	
	if(n < 0)
	{
		std::cout << "Number of shares can't be negative; "
		            << company << "shares set to 0.\n";
		shares = 0;            
    }	
    else
    {
		shares = n;
	}
	share_val = pr;
	set_tot();
}

Stock::~Stock()
{
	std::cout << "Bye, " << company << "!\n";
}

void Stock::buy(long num, double price)
{
	if(num < 0)
	{
		std::cout << "Number of shares purchased can't be negative. "
		            << "Transaction is aborted.\n";
	}
	else
	{
		shares += num;
		share_val = price;
		set_tot();
	}
}

void Stock::sell(long num, double price)
{
	using std::cout;
	if(num < 0)
	{
	    cout << "Number of shares sold can't be negative. "
	          << "Transaction is aborted.\n";
	}		
	else if(num > shares)
	{
		cout << "You can't sell more than you have! "
		      << "Transactionis aborted.\n";
	}
	else
	{
		shares -= num;
		share_val = price;
		set_tot();
	}
}

void Stock::update(double price)
{
	share_val = price;
	set_tot();
}

void Stock::show()
{
	using std::cout;
	using std:: ios_base;
	//set format to #.###
	ios_base::fmtflags orig = 
	    cout.setf(ios_base::fixed, ios_base::floatfield);
	std::streamsize prec = cout.precision(3);
	
	cout << "Company: " << company
	      << " Shares: " << shares << '\n';
	cout << " Share Price: $" << share_val;
	
	//set format to #.##
	cout.precision(2);
	cout << " Total Worth: $" << total_val << '\n';
	
	//restore original format
	cout.setf(orig, ios_base::floatfield);
	cout.precision(prec);          
}
